What is tadelakt? Tadelakt is a traditional Moroccan wall surfacing technique composed of lime plaster and black soap made from olives. When the ingredients are combined, a chemical reaction between the two creates a waterproof membrane, making tadelakt walls suitable for wet areas like showers and baths.

Tadelakt ( Moroccan Arabic: تدلاكت ‎, tadla:kt) is a waterproof plaster surface used in Moroccan architecture to make baths, sinks, water vessels, interior and exterior walls, ceilings, roofs, and floors. It is made from lime plaster, which is rammed, polished, and treated with soap to make it waterproof and water-repellant.